<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        show-icon
        effect="dark"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col>
          <span>选择商品分类：</span>
          <!-- 级联选择器 -->
          <el-cascader
            v-model="selectedKeys"
            :options="cateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children'
            }"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs
        v-model="activeName"
        @tab-click="handleTabClick"
        type="border-card"
      >
        <!-- 动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >修改</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >修改</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加对话框 -->
    <el-dialog
      :title="'添加' + titleText()"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        ref="addFormRef"
        :rules="addFormRoles"
        :model="addForm"
        width="50%"
      >
        <el-form-item :label="titleText()" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改' + titleText()"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        ref="editFormRef"
        :rules="editFormRoles"
        :model="editForm"
        width="50%"
      >
        <el-form-item :label="titleText()" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      selectedKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 获取到的参数列表
      manyTableData: [],
      onlyTableData: [],
      // 控制对话框的显示
      addDialogVisible: false,
      editDialogVisible: false,
      activeData: [],
      editForm: {},
      addForm: {
        attr_name: ''
      },
      addFormRoles: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      editFormRoles: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 查询展示三级参数列表
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选分类获取其参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId()}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      if (this.activeName === 'many') {
        this.manyTableData = res.data
        this.activeData = this.manyTableData
      } else this.onlyTableData = res.data
      this.activeData = this.onlyTableData
    },
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取需要传递给接口的id参数
    cateId() {
      if (this.selectedKeys.length === 3) {
        return this.selectedKeys[2]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 添加参数提交方法
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          `categories/${this.cateId()}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          this.$message.error('添加失败')
        }
        this.$message.success('添加成功')
        // 隐藏对话框
        this.addDialogVisible = false
        // 刷新参数列表
        this.getParamsData()
      })
    },
    async showEditDialog(id) {
      // 根据id获得商品参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId()}/attributes/${id}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品参数失败')
      }
      this.editForm = res.data

      this.editDialogVisible = true
    },
    // 编辑参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId()}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        console.log(res)
        this.getParamsData()
      })

      this.editDialogVisible = false
    },
    // 根据id删除对应的参数项
    async removeParams(id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 用户取消了操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId()}/attributes/${id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.error('删除参数成功')
      this.getParamsData()
    },
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 提交增加的tag到页面上
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求，返回更新的Tag
      this.saveAttrValues(row)
    },
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    },
    async saveAttrValues(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId()}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }

      this.$message.success('修改参数成功！')
      console.log(res)
    }
  },
  computed: {
    // 如果按钮需要禁用返回true
    isBtnDisable() {
      if (this.selectedKeys.length !== 3) {
        return true
      }
      return false
    }
  }
}
</script>
<style lang="less" scoped>
.el-alert {
  margin-bottom: 15px;
}
.el-tabs {
  margin-top: 15px;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>
